Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (10): 126-132.doi: 10.13475/j.fzxb.20210807107

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Bionic construction of three-dimentional super hydrophobic microfiber suede leather

GAO Qiang1, FAN Haojun1(), YAN Jun1, CHEN Yuguo2, ZHENG Ping2   

  1. 1. Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu, Sichuan 610065, China
    2. Shandong Tianqing Technology Development Co., Ltd., Dezhou, Shandong 253000, China
  • Received:2021-08-18 Revised:2022-07-14 Online:2022-10-15 Published:2022-10-28
  • Contact: FAN Haojun E-mail:fanhaojun@scu.edu.cn

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Abstract:

In order to tackle the poor durability of 2-D super hydrophobic microfiber suede leather, a construction method of 3-D super hydrophobic microfiber suede was proposed inspired by the hydrophobic structure of lotus leaf surface and the special 3-D network structure of microfiber nonwoven. The mixture of fluorine-containing waterborne polyurethane and nano precursor (tetraethoxysilane) was uniformly impregnated to superfine fiber nonwoven, and under weak acid conditions the nano precursor was induced to in-situ generate nano SiO2 particles inside the microfiber suede, which formed a lotus-like micro/nano rough surface with overall self-similarity. A 3-D super hydrophobic microfiber suede leather was bionically constructed, and its morphology, chemical composition, contact angle, friction durability and chemical stability were measured and characterized. The results show that the water contact angle of microfiber suede surface is up to 153.5°. After 2 100 times of abrasion, soaking for 24 h in aqueous solutions (pH=1 and 14) containing ethanol, p-xylene, tetrahydrofuran, and n-hexane, soap washing for 10 times, exposing to UV light for 24 h, and heat treatment, the water contact angle is still around 150°, demonstrating a durable 3-D super hydrophobicity.

Key words: bionic, microfiber, synthetic leather, suede leather, super hydrophobic, self-similarity

CLC Number: 

  • TS565

Fig.1

Preparation route of 3-D-SHMSL"

Tab.1

Water contact angles and sliding angles of various samples with different concentrations of TEOS"

TEOS质量分数/% 水接触角/(°) 滑动角/(°)
0.3 139.7 90
0.9 143.3 60
1.5 146.8 30
3.0 149.6 20
6.0 152.0 10
9.0 153.5 8
15.0 153.8 5
30.0 154.2 6

Fig.2

SEM images of different samples. (a) Blank sample; (b) 3-D-SHMSL"

Fig.3

XPS spectra of different samples. (a)Blank sample;(b)3-D-SHMSL"

Fig.4

Water droplet on surface, interface and cross-section of 3-D-SHMSL"

Fig.5

ATR-FTIR spectra of different regions on 3-D-SHMSL"

Fig.6

SEM images of different positions of 3-D-SHMSL. (a)Surface(×1 000);(b)Interface(×1 000);(c)Cross-section(×100)"

Fig.7

XPS spectra of different positions of 3-D-SHMSL. (a)Surface;(b)Interface;(c)Cross-section"

Tab.2

Relative element content of 3-D-SHMSL at different positions%"

样品 C O N Si F
表面 35.89 9.76 0.83 5.33 48.19
切面 35.68 11.32 0.63 5.68 46.69
截面 36.35 10.33 0.57 5.44 47.31

Tab.3

Relationship between water contact angles, sliding angles and abrasion cycles"

摩擦次数 水接触角/(°) 滑动角/(°)
0 152.80 8.0
200 150.97 6.0
400 152.47 7.5
600 150.35 6.5
800 151.25 7.2
1 200 153.75 7.6
1 800 150.50 7.9
2 100 152.00 7.7

Fig.8

SEM images(×1 000)(a)and XPS spectrum(b)of abraded 3-D-SHMSL"

Fig.9

Water contact angles of 3-D-SHMSL after immersion into different media for 24 hours"

Tab.4

Relationship between water contact angles, sliding angles and temperature"

温度/℃ 水接触角/(°) 滑动角/(°)
20 152.00 8.0
30 155.30 7.1
40 151.27 7.0
50 153.47 7.6
60 149.97 7.7
70 150.93 10.0
80 152.05 11.0
90 149.57 11.0

Fig.10

Changes of water contact angles and sliding angles with UV-irradiation time"

Fig.11

Changes of water contact angles and sliding angles with washing times"

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